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<?php
/**
* Geo API
*
* @package Geo
*/
if ( ! isset( $GLOBALS['wpdb']->app_geodata ) ) {
scb_register_table( 'app_geodata' );
}
add_action( 'appthemes_first_run', array( 'APP_Geo_Query', 'install' ), 9 );
add_action( 'deleted_post', 'appthemes_delete_coordinates', 10, 1 );
add_action( 'init', array( 'APP_Geo_Query', 'add_query_vars' ) );
add_action( 'parse_query', array( 'APP_Geo_Query', 'parse_query' ) );
add_filter( 'posts_clauses', array( 'APP_Geo_Query', 'posts_clauses' ), 10, 2 );
/**
* Returns geo coordinates for post.
*
* @param int $post_id
* @param bool $fallback_to_zero (optional)
*
* @return object
*/
function appthemes_get_coordinates( $post_id, $fallback_to_zero = true ) {
global $wpdb;
$coord = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->app_geodata WHERE post_id = %d", $post_id ) );
if ( ! $coord && $fallback_to_zero ) {
return (object) array( 'lat' => 0, 'lng' => 0 );
}
return $coord;
}
/**
* Sets geo coordinates for post.
*
* @param int $post_id
* @param float $lat
* @param float $lng
*
* @return int|bool Boolean false on failure
*/
function appthemes_set_coordinates( $post_id, $lat, $lng ) {
global $wpdb;
$coord = appthemes_get_coordinates( $post_id, false );
if ( ! $coord ) {
return $wpdb->insert( $wpdb->app_geodata, compact( 'lat', 'lng', 'post_id' ) );
} else {
return $wpdb->update( $wpdb->app_geodata, compact( 'lat', 'lng' ), compact( 'post_id' ) );
}
}
/**
* Deletes geo coordinates for post.
*
* @param int $post_id
*
* @return int|bool Boolean false on failure
*/
function appthemes_delete_coordinates( $post_id ) {
global $wpdb;
return $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->app_geodata WHERE post_id = %d", $post_id ) );
}
/**
* Enqueues scripts
*
* @param string $callback
*
* @return void
*/
function appthemes_enqueue_geo_scripts( $callback ) {
extract( appthemes_geo_get_args() );
$google_maps_url = ( is_ssl() ? 'https' : 'http' ) . '://maps.googleapis.com/maps/api/js';
$params = array(
'v' => 3,
'region' => $region,
'language' => $language,
'callback' => $callback
);
if ( ! empty( $libraries ) ) {
$params['libraries'] = implode( ',', (array) $libraries );
}
if ( isset( $api_key ) && ! empty( $api_key ) ) {
$params['key'] = $api_key;
}
$google_maps_url = add_query_arg( $params, $google_maps_url );
wp_enqueue_script( 'google-maps-api', $google_maps_url, array(), '3', true );
}
/**
* Returns an array of component arguments
*
* @return array
*/
function appthemes_geo_get_args() {
static $args = array();
if ( ! current_theme_supports( 'app-geo' ) ) {
return array();
}
if ( empty( $args ) ) {
// numeric array, contains multiple sets of arguments
// first item contains preferable set
$args_sets = get_theme_support( 'app-geo' );
if ( ! is_array( $args_sets ) ) {
$args_sets = array();
}
foreach ( $args_sets as $args_set ) {
foreach ( $args_set as $key => $arg ) {
if ( ! isset( $args[ $key ] ) ) {
$args[ $key ] = $arg;
} elseif ( is_array( $arg ) ) {
$args[ $key ] = array_merge_recursive( (array) $args[ $key ], $arg );
}
}
}
}
return $args;
}
/**
* Provides 'location' => 'San Francisco' and 'orderby' => 'distance' public query vars.
*/
class APP_Geo_Query {
/**
* Creates database table for geo coordinates.
*
* @return void
*/
static function install() {
scb_install_table( 'app_geodata', "
post_id bigint(20) unsigned NOT NULL,
lat decimal(10,6) NOT NULL,
lng decimal(10,6) NOT NULL,
PRIMARY KEY (post_id)
" );
}
/**
* Deletes database table for geo coordinates.
*
* @return void
*/
static function uninstall() {
scb_uninstall_table( 'app_geodata' );
}
/**
* Calculates the distance between two points on the surface of an Earth-sized sphere
*
* @param float $lat_1
* @param float $lng_1
* @param float $lat_2
* @param float $lng_2
* @param string $unit
*
* @return float
*/
public static function distance( $lat_1, $lng_1, $lat_2, $lng_2, $unit ) {
$earth_radius = ('mi' == $unit) ? 3959 : 6371;
$alpha = ($lat_2 - $lat_1)/2;
$beta = ($lng_2 - $lng_1)/2;
$a = sin(deg2rad($alpha)) * sin(deg2rad($alpha)) +
cos(deg2rad($lat_1)) * cos(deg2rad($lat_2)) *
sin(deg2rad($beta)) * sin(deg2rad($beta));
$distance = 2 * $earth_radius * asin(min(1, sqrt($a)));
$distance = round( $distance, 4 );
return $distance;
}
/**
* Calculates the radius of the circle described around the rectangle with
* the given coordinates of the vertices.
*
* The center of the circle is not necessary the center of rectangle.
* This why the radius is always more or equal half of rectangle diagonal.
*
* @param float $lat_c The latitude of the circle center.
* @param float $lng_c The longitude of the circle center.
* @param float $lat_1 The latitude of the NE boundary corner.
* @param float $lng_1 The longitude of the NE boundary corner.
* @param float $lat_2 The latitude of the SW boundary corner.
* @param float $lng_2 The longitude of the SW boundary corner.
* @param string $unit The distance unit.
*
* @return int
*/
static function get_smart_radius( $lat_c, $lng_c, $lat_1, $lng_1, $lat_2, $lng_2, $unit ) {
$distance_a = self::distance( $lat_c, $lng_c, $lat_2, $lng_2, $unit );
$distance_b = self::distance( $lat_c, $lng_c, $lat_1, $lng_1, $unit );
$distance_c = self::distance( $lat_c, $lng_c, $lat_1, $lng_2, $unit );
$distance_d = self::distance( $lat_c, $lng_c, $lat_2, $lng_1, $unit );
return max( $distance_a, $distance_b, $distance_c, $distance_d, 1 );
}
static function add_query_vars() {
global $wp;
$wp->add_query_var( 'location' );
$wp->add_query_var( 'radius' );
$wp->add_query_var( 'lat' );
$wp->add_query_var( 'lng' );
}
static function parse_query( $wp_query ) {
extract( appthemes_geo_get_args() );
$location = trim( $wp_query->get( 'location' ) );
if ( ! $location ) {
return;
}
$wp_query->is_search = true;
$smart_radius = false;
$radius = is_numeric( $wp_query->get( 'radius' ) ) ? $wp_query->get( 'radius' ) : false;
if ( ! $radius ) {
$radius = ! empty( $default_radius ) && is_numeric( $default_radius ) ? $default_radius : false;
}
$args = array(
'address' => urlencode( $location ),
'sensor' => 'false',
'region' => $region,
'language' => $language,
);
$url = add_query_arg( $args, 'http://maps.googleapis.com/maps/api/geocode/json' );
$transient_key = 'app_geo_' . md5( $url );
if ( defined( 'WP_DEBUG' ) ) {
$geo_coord = false;
} else {
$geo_coord = get_transient( $transient_key );
}
if ( ! $geo_coord ) {
$response = wp_remote_get( $url );
$geocode = json_decode( wp_remote_retrieve_body( $response ) );
if ( ! $radius ) {
if ( isset( $geocode->results[0]->geometry ) ) {
$geometry = $geocode->results[0]->geometry;
// bounds are not always returned, so fall back to viewport
$bounds_type = isset( $geometry->bounds ) ? 'bounds' : 'viewport';
$radius = self::get_smart_radius(
$geometry->location->lat,
$geometry->location->lng,
$geometry->{$bounds_type}->northeast->lat,
$geometry->{$bounds_type}->northeast->lng,
$geometry->{$bounds_type}->southwest->lat,
$geometry->{$bounds_type}->southwest->lng,
$unit
);
$smart_radius = true;
}
}
if ( $geocode && 'OK' == $geocode->status ) {
$geo_coord = array(
'lat' => $geocode->results[0]->geometry->location->lat,
'lng' => $geocode->results[0]->geometry->location->lng,
);
set_transient( $transient_key, $geo_coord, 60*60*24*7 ); // Cache for a week
}
}
// Final fallback just in case $wp_query->get( 'radius' ) and default_radius are not set and smart_radius fails due to API not returning a bounds/viewport.
if ( ! $radius ) {
$radius = 50;
}
if ( $geo_coord ) {
$wp_query->set( 'app_geo_query', apply_filters( 'appthemes_geo_query', array(
'lat' => $geo_coord['lat'],
'lng' => $geo_coord['lng'],
'rad' => $radius,
'smart_radius' => $smart_radius,
) ) );
} else {
// Fall back to basic string matching
$wp_query->set( 'meta_query', array(
array(
'key' => 'address',
'value' => $location,
'compare' => 'LIKE'
)
) );
}
}
static function posts_clauses( $clauses, $wp_query ) {
extract( appthemes_geo_get_args() );
global $wpdb;
$geo_query = $wp_query->get( 'app_geo_query' );
if ( ! $geo_query ) {
return $clauses;
}
extract( $geo_query, EXTR_SKIP );
$R = 'mi' == $unit ? 3959 : 6371;
$clauses['join'] .= $wpdb->prepare( " INNER JOIN (
SELECT post_id, ( %d * acos( cos( radians(%f) ) * cos( radians(lat) ) * cos( radians(lng) - radians(%f) ) + sin( radians(%f) ) * sin( radians(lat) ) ) ) AS distance FROM $wpdb->app_geodata
) as distances ON ($wpdb->posts.ID = distances.post_id)
", $R, $lat, $lng, $lat );
$clauses['where'] .= $wpdb->prepare( " AND distance < %f", (float) $rad );
if ( 'distance' == $wp_query->get( 'orderby' ) ) {
$clauses['orderby'] = 'distance ' . ( 'DESC' == strtoupper( $wp_query->get( 'order' ) ) ? 'DESC' : 'ASC' );
}
return $clauses;
}
}